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激光通信的视频采集需要嵌入式标准化接口的实时数字采集,采取FPGA+SAA7111A的架构来实现系统的实时化、小型化、标准化和模块化。FPGA作为控制器,经I2C总线对视频解码芯片SAA7111A进行初始化。设计了两个读写互斥的存贮单元,分别用来存贮所采集的奇场和偶场数据,并专门设计了一个用于和图像处理单元通信的标准握手接口;为减小传送数据流量,对采集后的图像进行了提取和预处理。通过反复试验仿真,基于FPGA的整个图像采集方案可行,能够在图像采集处理系统中得以应用。
The video acquisition of laser communication needs the real-time digital acquisition of embedded standardized interface, adopts the architecture of FPGA + SAA7111A to realize the system real-time, miniaturization, standardization and modularization. FPGA as a controller, through the I2C bus video decoder chip SAA7111A initialization. Two memory cells which read and write mutually exclusive are designed respectively for storing odd and even field data collected and a standard handshake interface specially designed for communicating with the image processing unit is designed. In order to reduce the transmission data Traffic, the collected images were extracted and pre-processed. Through trial and error simulation, the entire FPGA-based image acquisition scheme is feasible and can be applied in the image acquisition and processing system.